/Engine/Source/Runtime/Slate/Public/Widgets/Views/STreeView.h
int32 PopulatePinnedItems ( const [TArray](API\Runtime\Core\Containers\TArray)< ItemType > & InItemsSource, [TArray](API\Runtime\Core\Containers\TArray)< ItemType > & InPinnedItems, const [STableViewBase::FReGenerateResults](API\Runtime\Slate\Widgets\Views\STableViewBase\FReGenerateResults) & Results )